Device for delivering measured quantities of liquids



Nov. 21, 1939. F. w. BERWICK ET AL DEVICE FOR DELIVERING MEASURED QUANTITIES 0F LIQUID Filed Nov. 29, 1957 2 Sheets-Sheet 1 INVEN'IKRS FREDERICK W. BERWICK K/Wm m m m m mm m m Nov. 21, 1939. F.'W. BERWICK ET AL 2,180,702

DEVICE FOR' DELIVERING MEASURED QUANTITIES 0F LIQUID Filed Nov. 29, 1937 2 Sheets-Sheet 2 mamas mEnmIcx w. smucx ALERT a. nmwxcx ATTGKNEYS Patented Nov.. 21, 1939 I v I I I V -UNITED STATES PATENT OFFICE DEVICE FOR DELIVERING MEASURED QUANTITIES F LIQUID Frederick William Berwick and Albert George Berwick, Streatham, London, England, assignors, by mesne assignments, to The De Laval Separator Company, New York, N. Y., a corporation oi New Jersey Application November 29, 1937, Serial No. 177,146 In Great Britain February 3, 1937 6 Claims. (01. 221-102) This invention relates to devices for delivering Fig. 2 is a sectional plan taken on the line measured quantities of liquid and to those of the IIII of Fig. 1; kind wherein a piston or plunger is utilised to Fig. 3 is a sectional elevation similar to Fig. 1 eject a quantity of liquid from a cylindrical but showing the parts at the completion of op- 5 chamber. The invention has particular although eration and 5 not exclusive reference to the delivery of meas- Fig. 4 is a detail view of the valve member. ured quantities of oil and similar viscous liquids In the construction illustrated the improved and has for its object to provide a device which is device for delivering measured quantities of liqdesigned to overcome certain difficulties which uid comprises a measuring chamber l which in have been experienced in the delivery of measthe construction shown is a metal cylinder but ured quantities of such liquids and which will which may be formed of glass or other material effectively prevent leakage into and out of the or may have glass panels inserted.

measuring chamber and ensure that an exact Axially movable through the lower end of the predetermined quantity of liquid will be supplied, said measuring chamber is a hollow cylindrical at each operation of the device. operating member 2 which carries within the said 15 According to the invention a device for delivchamber a piston embodying a disc 'or cup ering measured quantities of liquid is provided washer 3 of india rubber or other resilient or comprising a measuring chamber and an operatflexible material. The interior of the operating ing member movable axially of said measuring member 2 communicates with the interior of the chamber and adapted when operated to close the measuring chamber through laterally directed go inlet to said chamber and thereafter to force ports 4 formed in a detachable upper portion liquid Out Of Said chambe t rougha pa age in M. The upper portion of the measuring cham- Said Operating e b o an Outlet at ts Oute bet is closed by a cover 5 having a central inlet ndaperture 6 above which the walls of the measuring According to a preferred form of the invention chamber are continued as a socket 1 into which 25 a device for delivering measured quantities of the mouth or outlet of a liquid receptacle can quid mpris s am a u i c am r. an axially be temporarily secured. This socket may be meveble Valve Operating member therein and formed with an internal screw thread as shown m n ex n n r ghthe ba of the dev or it maybe screw threaded externally and it is actuating S d Operating member by Upwa d preferably provided with a washer 8 .to facilitate 30 inward pressure wherein Said Operating a fluid tight joint being made between it and the her carries means for closing the liquid inlet to tl t from th receptacle, This part of theapthe measuring chamber, a piston and a valve paratus, however, is subject to considerable modcontrolled outlet all arranged so that after closure lfication in accordance with the size and general 0f the Said inlet thep is ed ativ y character of the liquid receptacle to which the 35 to the closure member and the valve opened to measuring device is to be attached. fo ce the a u q a y of liquid t ough an Mounted within the open upper portion I4 of Outlet in theepeletlng memberthe operating member 2 is a valve stem 9 which According to another feature of the invention carries at its upper end a disc valve In which in a device for delivering measured quantities of its uppermost position, as hereinafter described, 40

liquid Comprises a measuring Chamber and an closes the inlet 6. The valve stem 9 has a peroperating member movable axially therein to close ti [I of r d ced diameter so as to permit, in t e qu d inlet to said chamber and thereafter all positions, free communication between the force the liquid out of the said chamber through t i of th measurin chamber I and the a p e n e Operating member whic a s interior of the upper portion l4 of the operating 45 a Piston embodying a resilient 0! fle b e d s iember. The lower end of the valve stem 9 mounted so that it makes edge 01 li e Contact carries a valve member I2 which normally seats, With the Wall Of the measuring chamber. as shownin Fig. 1, on a valve seating l3 formed Reference will nowbe made to the accompanywithin the operating member 2 and preferably ing drawings which illustrate by way of example at the lower end of the upper portion I4 which 50 a construction according to the invention and is screw threaded into the hollow sleeve 2. A in which: spring l5 disposed between the valve member Ill Fig. 1 is a sectional elevation showing the and a shoulder 30 on the' portion 14 of the operimproved liquid measuring device with the parts ating member urges the said valve in a direction in the inoperative position; towards its seating but the valve is normally a prevented from moving above the position shown in Fig. 1 by engagement of the valve member l2 with its seating i3.

The piston consists of the annular disc of india rubber or other material 3 which is disposed between metal flanges or collars l6 and i1 mounted around a recessed portion l8 of the upper portion ll of the operating member and secured in positionby screwing thelower portion2 on to the upper portion It. The lower flange I! is of larger diameter than the upper flange and each flange has an upwardly extending rim so that when the disc 3 has been positioned between the two flanges the shape of the upwardly bent rims causes the annular disc to be bent upwards until it assumes a frusto-conical formation as shown in Fig. 1. Alternatively, the disc 3 may be preformed to a frusto-conical shape. In this arrangement the upper edge only of the also makes contact with the wall of the measuring chamber and the diameter of the disc is such that when assembled before insertion in the said chamber it is greater than the diameter of the interior of the chamber. This arrangement possesses the advantage, particularly when using a glass walled measuring chamber, that the india rubber disc 3 will accommodate itself automatically to any irregularities of shape in the measuring chamber whilst the fact that it only makes edge contact with the inner wall of the chamber will prevent it binding thereon under pressure of liquid whilst making fluid tight contact in all positions. Furthermore, when used with liquids which tend to swell india rubber, the swelling of the disc 3 will only tend to force its outer edge into closer contact with the wall of the chamber and will not cause surface contact to any appreciable ex-- tent.

The piston is normally maintained in the inoperative position by means of a spring as which rests upon the flange iii and at its upper end bears against an annular disc 20 disposed at the top of the measuring chamber and formed with a downwardly extending inner lip 2i which prevents displacement'of the spring. Alternatively, the disc Zii can be dispensed with and the 1ip 2i formed in the cover 5 of the measuring chamber.

The base 22 of the measuring chamber which is detachable to permit assembly of the piston therein is formed with air inlets 23 which prevent the formation of a vacuum below the piston as it rises on its delivery stroke. The operating member 2 is preferably provided, externally oi the measuring chamber, with two or more laterally extending arms 2% or with a disc so as to be operated by upward pressure of a receptacle to be filled. The exterior of the operating member may also be provided with a collar adapted to come into contact during the delivery stroke with the base of the measuring chamber and thus limit the extent of the stroke to determine the amount of liquid to be delivered, and by arranging for the collar to be adjustable in position, the amount to be delivered at each operative stroke may be varied.

The lower open end of the operating member is provided with a constricted outlet aperture 25 formed in a detachable nozzle 26, the upper or inner portion of this outlet being surrounded by an annular lip 21 and an annular channel 28 which collects any drips falling down the inner walls of the operating member 2 after the delivery of a measured quantity of liquid. The outlet 25 terminates in an outwardly flared lip 29 at its lower end provided to prevent the formareservoir.

tion of drips on the lower end of the outlet immediately after the discharge of a measured stem 9 so that the seating i3 is lifted above and away from the valve member l2. In this manner the outlet is opened so that the continued upward movement of the piston will force liquid from the interior of the measuring chamber through the ports 4 and into the interior of the operating member to be dischargedthrough the outlet 25. At the conclusion of the operative stroke the parts are in the position shown in Fig. 3.

-When the measured quantity of liquid has been I delivered into a receptacle the upward pressure on the operating member 2 is relaxed so that the springs i5 and iii are free to force the piston downwards and move the valve stem 9 into a position in which the valve I2 is again brought into contact with its seating 58. The suction produced by the downward movement of the piston causes an inflow of air through the ports i in the operating member to the interior of the upper portion of the measuring chamber which air i subsequently displaced by a fresh charge of liquid which enters through the inlet 8 from the The spring it retains the inlet 6 closed until the operating member reaches a position in which the seating it engages the valve member [2 and withdraws the valve member it from the inlet. of the incoming fresh charge through the operating member 2 is prevented.

The invention is more particularly designed for delivering measured quantities of liquids such as oil as the pressure exerted by the upward movement of the piston will positively eject from the measuring chamber the oil whose natural viscosity would tend to prevent complete evacuation of the measuring chamber by gravitational methods.

We claim:---

1. A device for delivering measured quantities of liquid comprising a measuring chamber, an operating member movable axially within said measuring chamber and having an outlet passage extending axially therethrough to an outlet at its outer end, a valve member slidably guided in the inner end of the outlet passage in said operating member and having a valve on its inner end adapted to close the inlet to said chamber, and a piston mounted on said operating member to force liquid out of the said chamber through said passage in the operating member to the outlet at the outer end thereof.

2. A device for delivering measured quantities of liquid comprising a measuring chamber, a tubular axially movable operating member therein extending through a wall of said chamber for actuation by inward pressure and having outlet ports and.an outlet passage extending axially therethrough to its outer end, a valve seat member in the inner end of said operating member, a valve member guided in said valve seat member and having a valve onits inner end for closing the inlet to said measuring chamber, a piston mounted on said operating member for forcing liquid from said chamber, and a valve on the outer end of said valve member and cooperable with said valve seat member for controlling the outlet passage through said operating member.

3. A device for delivering measured quantities of liquid comprising a measuring chamber, an operating member movable axially in said chamber and having a discharge passage therein and means to close the liquid inlet to said chamber,

said member being operable to cause said means to close the liquid inlet to said chamber and to thereafter force the liquid out of said chamber through said passage in the operating member, and a piston carried by said operating member and embodying a resilient disc mounted so that its edge only engages and makes a line contact only with the wall of the measuring chamber.

4. A device for delivering measured quantities of liquid according to claim 3, wherein said piston consists of a cupped disc of resilient material of frusto-conical form mounted between two discs fixed around the operating member and which maintain the resilient disc in a position in which its edge only engages and makes a line contact with the interior wall of the measuring chamber.

5. A device for delivering measured quantities or liquid comprising a measuring chamber, a hollow tubular operating member vertically movable axially in said chamber and projecting through the base thereof and having an outlet at its lower end, means for connecting said measuring chamber to a source of liquid supply, a piston carried by said operating member and including a resilient element making line contact with the wall of the chamber, a valve movably mounted in the upper end of the operating member for closing the inlet to said chamber, a valve stem depending from said valve, a second valve carried by said stem for closing the outlet in the operating memand a spring for normally holding said second valve closed and for holding the inlet valve closed after the initial upward movement of the operating member.

6. A device for delivering measured quantities of a fluid comprising a measuring chamber having an inlet, a tubular operating member movable axially in said chamber and having a passage extending axially'therethrough and .providing an outlet at its outer end, a valve member slidably fitting in and guided by said passage in the operating member, a valve on the inner end of said valve member and operable by inward movement thereof to close the inlet to said chamber, a valve on said valve member within said passage for closing the outlet portion thereof when said operating member is moved outwardly, and a piston including a cupped disk mounted on the operating member,- and means on the operating member maintaining said cupped disk in a position in which its peripheral edge only engages and makes a line contact with the interior wall of the measuring chamber.

FREDERICK WILLIAM BERWICK. ALBERT GEORGE BERWICK. 

